Hominid Pelvises

Australopithecine pelvises are far more similar to humans than to those
of apes, and shows that they were undoubtedly bipedal. The pelvis of
Lucy (A. afarensis), although not shown here, is very similar to
that of A. africanus.

Despite the overall similarity, australopithecine pelvises are not
identical to those of humans. There are a number of differences, some
of which are more obvious when viewed from other angles.

This illustration is from "Humankind Emerging", edited by Bernard
Campbell.